IO通讯交互数据的通讯协议: 它没有1线,2线那样节省IO资源,但是它的通讯速度绝对最快,无需延时,且不用中断,还可以对等传输. -IO interactive data communication protocol: it does not have one line, 2 line as IO-saving resources, but it is absolutely the fastest speed of communication, without delay, and wi